ypfiles

Description

The NIS network information service uses a distributed, replicated database of dbm
files , in ASCII form, that are contained in the /var/yp directory
hierarchy on each NIS server.

A dbm database served by the NIS server is called a NIS
map. An NIS domain is a subdirectory of /var/yp that contains a
set of NIS maps on each NIS server.

Standard nicknames are defined in the file /var/yp/nicknames. These names can be
used in place of the full map name in the ypmatch and
ypcat commands. Use the command ypwhich-x to display the current set of
nicknames. Use the command ypwhich-m to display all the available maps.
Each line of the nickname file contains two fields separated by white
space. The first field is the nickname, and the second field is
the name of the map that it expands to. The nickname cannot contain
a dot (.).

Represents the shared configuration used by all NIS components. The properties managed by this service are contained in the config property group. Those properties are:

config/domainname

NIS domainname

This is a single valued property containing the IS domainname (/etc/defaultdomain)

config/ypservers

ypservers Hosts/IP addresses

This is a multi-valued property. Each value contains a server to which the NIS client is allowed to bind.

config/securenets

securenets network data

This is a multi-valued property. Each value defines the hosts and networks that are granted access to information in the served domain.

NIS to LDAP (N2L)

If the /var/yp/NISLDAPmapping configuration file is present, the NIS server operates in
NIS to LDAP (N2L) mode. In this mode, NIS maps are stored
in a new set of DBM files, prepended by the LDAP_ prefix,
at /var/yp/domainename. These files are used as a cache backed by information from
an LDAP server. Additional DBM files are created in the same directory
to hold the cache's TTL values.

N2L mode enables NIS clients to be supported in an LDAP environment.

In N2L mode, the old style DBM files, NIS source files, and
the ypmake(1M) utility have to role. They are retained to enable easy
conversion back to the traditional mode, if required.

Converting from N2L to Traditional NIS

When NIS is operating in N2L mode, it uses a new set
of NIS maps with an LDAP_ prefix, based on the contents of
the LDAP DIT. The NIS source files are unused and become out
of date. If you wish to convert back to the traditional NIS
mode, the N2L configuration file should be deleted. The system then returns to
using the standard map files. Optionally, the N2L mode map files, /var/yp/*/LDAP_*
can also be deleted.

If you want to run the system in traditional mode with information
based on the DIT, then the NIS source files must be regenerated
based on the N2L maps. To regenerate the NIS source files based
on the N2L maps, run ypmap2src(1M).

Files

/var/yp

Directory containing NIS configuration files.

/var/yp/binding

Stores the information required to bind the NIS client to the NIS server.

/var/yp/binding/ypdomain/ypservers

Contains the servers to which the NIS client is allowed to bind.

/var/yp/Makefile

Builds the NIS ndbm databases.

/var/yp/nicknames

Nicknames file.

/var/yp/securenets

Defines the hosts and networks that are granted access to information in the served domain. This file is read at startup time by ypserv and ypxfrd.